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- Question
Reuptake refers to the
Options- A. reabsorption of excess neurotransmitter molecules by a sending neuron
- B. release of hormones into the bloodstream
- C. movement of neurotransmitter molecules across a synaptic gap
- D. inflow of myelin through an axon membrane
- Correct Answer
- reabsorption of excess neurotransmitter molecules by a sending neuron
ExplanationReuptake refers to the process in the brain of neurons to retrieve chemicals that were not received by the next neuron. Neurons are cells in the brain that have miniscule spaces between them. They communicate with each other by sending chemicals across the space to the next neuron.
- 1. Who discovered the monomers of nucleic acids?
Options- A. James Watson, Francis Crick, and Rosalind Franklin
- B. Friedrich Miescher
- C. Phoebus Levene
- D. Gerardus Johannes Mulder and Jöns Jacob Berxelius Discuss
- 2. What does the central nervous system consists of?
Options- A. Brain
- B. Spinal cord
- C. Nerves
- D. All the above Discuss
- 3. Which of the following statements about aldosterone is NOT correct?
Options- A. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
- B. Aldosterone is stimulated by decreased plasma sodium levels and increased plasma potassium levels.
- C. Aldosterone is produced in the adrenal cortex.
- D. Aldosterone increases the number of passive sodium channels in the luminal membrane of the distal tubule and collecting duct, thus aiding sodium reabsorption. Discuss
- 4. Which best describes transformation in bacteria?
Options- A. Bacteria take DNA from their environment.
- B. Bacteria inject DNA into another cell.
- C. Bacteria lie dormant for many weeks.
- D. Bacteria transfer DNA with a bacteriophage. Discuss
- 5. Origins of genetic variation
Options- A. intragenic recombination
- B. mutation
- C. reticulation
- D. All the above Discuss
- 6. The term facultative anaerobe refers to an organism that
Options- A. Uses oxygen or grows without oxygen.
- B. Requires less oxygen than is present in air.
- C. Prefers to grow without oxygen.
- D. Is killed by oxygen. Discuss
- 7. The main result of aerobic respiration is the
Options- A. production of lactic acid as an end product
- B. production of ATP from the breakdown of glucose
- C. conversion of radiant energy into chemical energy
- D. storage of energy in a polysaccharide Discuss
- 8. Which best summarizes the concept of natural selection?
Options- A. the fittest organisms survive and reproduce
- B. an organism will always adapt to its environment
- C. an organism will always mutate to survive
- D. a mutation always makes a species fitter Discuss
- 9. Which of the following is true about veins?
Options- A. Veins carry blood away from the heart, while arteries carry blood to the heart.
- B. Veins are more muscular than arteries.
- C. Veins have valves; arteries do not.
- D. Veins have a smaller diameter lumen than arteries. Discuss
- 10. What is the purpose of the mucus in your nose?
Options- A. Protects lungs
- B. Clear air passage
- C. Protects nose
- D. All of the above Discuss
Biology problems
Search Results
Correct Answer: Phoebus Levene
Explanation:
Deoxyribonucleic acid (DNA) is a nucleic acid polymer composed of monomers called nucleotides. Nucleotides are composed of three components: (1) a pentose sugar; (2) a nitrogenous base; and (3) one to three phosphate groups.
Phoebus Levene, a Russian biochemist was the first to discover the nucleotide and the first to correctly identify the way nucleic acid molecules, DNA.
Correct Answer: All the above
Explanation:
The central nervous system CNS is responsible for integrating sensory information and responding accordingly.
It consists of two main components::
1. The brain
2. The spinal cord
The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement. The brain can be divided into four main lobes: temporal, parietal, occipital and frontal.
The spinal cord serves as a conduit for signals between the brain and the rest of the body.
Correct Answer: Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
Explanation:
Aldosterone, the main mineralocorticoid hormone, is a steroid hormone produced by the zona glomerulosa of the adrenal cortex in the adrenal gland. It is essential for sodium conservation in the kidney, salivary glands, sweat glands and colon.
Correct Answer: Bacteria take DNA from their environment.
Explanation:
"Bacteria take DNA from their environment" is what best describes transformation in bacteria.
Correct Answer: All the above
Explanation:
Random mutations are the ultimate source of genetic variation. Mutations are likely to be rare and most mutations are neutral or deleterious, but in some instances, the new alleles can be favored by natural selection. Polyploidy is an example of chromosomal mutation.
Mutations are changes in the DNA. A single mutation can have a large effect.
1) mutation - an alteration in DNA sequence, various types
2) intragenic recombination - results in entirely new associations of genes not present in either parental genome.
Two forms of intragenic recombination:
a) crossing over
b) independent assortment
3) reticulation ? acquisition of genetic material from unrelated or relatively unrelated sources (e.g., hybrid species, horizontal gene transfer).
Correct Answer: Uses oxygen or grows without oxygen.
Explanation:
The term facultative anaerobe refers to an organism that which uses oxygen when it is present or grows without oxygen when it is not there.
Correct Answer: production of ATP from the breakdown of glucose
Explanation:
The three steps within the aerobic respiration process are glycolysis, the citric acid cycle, and oxidative phosphorylation.
Photosynthesis builds glucose, and what was built in photosynthesis is broken down during aerobic respiration.
Hence, production of ATP from the breakdown of glucose is the main result of aerobic respiration.
Correct Answer: the fittest organisms survive and reproduce
Explanation:
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Correct Answer: Veins have valves; arteries do not.
Explanation:
Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.
Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
Correct Answer: Protects lungs
Explanation:
When you breathe in air through your nose, it contains lots of tiny things, like dust, dirt, germs, and pollen.
The air enters our body through the nose. However, before it enters the lungs, it must be heated and purified. Many dust particles that enter along with the air are removed in the nose by mucus and thus it protects lungs.
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