Who discovered the monomers of nucleic acids?

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: blood

Explanation:

In human body, glucose is stored in blood stream before it is converted to glycogen. Excess glucose is stored in the form of fats. After conversion, glycogen is stored in Muscles and Liver.

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: 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.