6) A danger signal from the environment arrives in the human brain as a sensory

Question

6)

A danger signal from the environment arrives in the human brain as a sensory nerve impulse that triggers the hypothalamus to

Select one:

release a hormone that ulitimately, with enough repetition of the response, leads to Alzheimer's disease.

send a chemical messenger to block cardiac nerve impulses.

release a chemical messenger into the bloodstream that sends signals around the body.

act like muscle and contract, causing headache.

produce sleep-inducing hormones.

7)Suppose a gene is regulated by an activator and s repressor. All elements of gene expression are present and the chromosome at the location of the gene is decondensed. What happens to this gene's expression if a DNA mutation abolishes the binding of the repressor protein to the promoter region of the gene?

The gene is

Select one:

inactivated by condensation into heterochromatin.

transcribed at very, very low levels in the cell.

not transcribed.

transcribed at very high levels in the cell.

transcribed into a mutant form of mRNA that is then translated to mutant protein.

8)Signals, as they move through a cell, often are transmitted from protein to protein. This is the way that the cell can

Select one or more:

reduce the amount of ATP needed to produce the cellular outcome.

change a small response to a large response in organism.

amplify the signal as it is transferred from protein to protein.

be in two signaling states at the same time.

divide the signal to send it to more than one target.

9)Which of the following statements about enzymes is/are not true?

Select one or more:

Enzymes are encoded by genes.

Enzymes are involved in most metabolic reactions in the human body.

Enzymes are usually, but not always, proteins.

Enzymes can make and break only covalent bonds.

Enzymes slow down biochemical reactions that otherwise might burn up all of a cell's ATP.

10 )The term "sex-linked" mutation refers to a mutation in a gene

Select one:

involved in developing the gonads.

on the X or Y chromosome that exhibits a sex-specific inheritance pattern.

regulating estrogen production.

activated after onset of sexual activity.

required for hair growth in males.

Explanation / Answer

Q 6). c. release a chemical messenger into the bloodstream that sends signals around the body.act like muscle and contract, causing headache.

During fight or flight conditions, our body activates sympathetic nervous system by releasing norepinephrine and adrenaline. Adrenaline causes raised blood pressure and raised glucose levels. Skeletal muscles also contract due to ACh release and is powered by hyperglycemia caused by adrenaline. Skeletal muscle contraction is needed because we want to move immediately from that area. Increased blood pressure may cause headache.

7. transcribed at very high levels in the cell.

In the absence of repressors, gene remains in activated state.

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