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- Question
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.
- Correct Answer
- Veins have valves; arteries do not.
ExplanationVeins 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.
- 1. 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
- 2. 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
- 3. 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
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. Which of the following is true about blood plasma?
Options- A. The main protein component is hemoglobin.
- B. It is a faint yellow fluid.
- C. It is the same as serum but without the clotting proteins.
- D. It is about 90% water. Discuss
- 8. Which of the following is a characteristic of the Ascomycota?
Options- A. Sac formation
- B. Zygospore formation
- C. Basidium formation
- D. All of the above Discuss
- 9. A gland below the bladder and surrounding the urethra is
Options- A. prostate
- B. seminal vesicle
- C. bartholin
- D. vas deferens Discuss
- 10. Which statement regarding the mammalian heart is correct?
Options- A. Blood is pumped from the heart via the atria.
- B. Oxygen-loaded blood moves only through the right side of the heart.
- C. When the right atrium contracts, it forces blood into the left atrium.
- D. In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs. Discuss
Biology problems
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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: 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: 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: reabsorption of excess neurotransmitter molecules by a sending neuron
Explanation:
Reuptake 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.
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: 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.
Correct Answer: It is about 90% water.
Explanation:
The first option is incorrect because it is devoid of blood cell, also red blood cells so doesn?t contains haemoglobin.
The second option is incorrect because plasma is colorless.
The third option is also incorrect because plasma contains the clotting factors.
Correct Answer: Sac formation
Explanation:
Ascomycota is a division or phylum of the kingdom Fungi that, together with the Basidiomycota, form the subkingdom Dikarya. Its members are commonly known as the sac fungi or ascomycetes.
Hence, Sac formation is a characteristic of the Ascomycota fungi.
Correct Answer: prostate
Correct Answer: In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs.
Explanation:
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs is correct regarding mammalian heart.
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