Sharks and rays deal with the osmotic stress of living in seawater mainly by

a. active transport of ions into the body through the gills.
b. excreting nitrogenous wastes through their kidneys as urea.
c. active transport of ions out of the body by chloride cells.
d. excreting excess salt through the actions of specialized salt glands in their heads.
e. maintaining high levels of urea and trimethylamine oxide in body fluids.


E

Biology & Microbiology

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Two STR loci were determined to have the following allele frequencies in the general population: STR A STR B Alleles: 1A: 0.1 1B: 0.4 2A: 0.55 2B: 0.4 3A: 0.25 3B: 0.2 4A: 0

1 A suspect in a criminal trial was genetically tested for these loci and was found to have the genotype (1A, 1A) for STR A and (2B, 2B) for STR B–homozygous for both loci. What is the probability that a randomly sampled person from this population would also have this genotype?

Biology & Microbiology

The most common mode of reproduction in bacteria is:

a. binary fission. b. transformation. c. transduction. d. conjugation. e. mitosis.

Biology & Microbiology

The ________ ear is the location of the pinna and auditory canal

Fill in the blank(s) with correct word

Biology & Microbiology

Griffith’s transformation in Streptococcus pneumoniae led to the discovery of

a. DNA as the molecular basis of heredity. b. mRNA as the template for protein synthesis. c. polysaccharides as the major component of capsules. d. Archaea as the third domain of life.

Biology & Microbiology