The secretion of which hormone decreases when calcium blood levels increase?

a. calcitonin
b. parathyroid hormone
c. thyroid hormone
d. epinephrine
e. norepinephrine


B

Biology & Microbiology

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Many eukaryotes have a DNA glycosylase that specifically removes T residues from DNA when paired with G. Why is it better to repair the G-T pairing to G-C by removing the T than to remove the G and form an A-T pair?

A. G-C pairs can form three hydrogen bonds between them and are therefore stronger. B. Oxidative damage to guanine by alkylation is the most common reason for G-T pairs, so removal of the T will maintain the original G-C pair. C. T bases easily tautomerize into C bases, so removing the T will make sure the pair stays in its original form. D. G-C basepairs occur more frequently in cells. E. All of the choices provided are potential reasons.

Biology & Microbiology

Which of the following immunodeficiency disorders could possibly be treated or prevented by gene therapy during the embryological stage?

A. AIDS B. X-linked agammaglobulinemia (XLA) C. Asthma D. None of these disorders can be treated by gene therapy during the embryological stage.

Biology & Microbiology

The collected data of a Kirby-Bauer test is often presented in

A) a minimal inhibitory concentration report. B) a pie chart. C) an antibiogram. D) a graph. E) a bacteriostatic or bactericidal report.

Biology & Microbiology

There are many more olfactory cells than there are taste buds.

Answer the following statement true (T) or false (F)

Biology & Microbiology