A hypothetical population has two alleles for a gene: A and a. In a random sample of 50 individuals, 20 are homozygous for a, 20 are homozygous for A, and 10 are heterozygous. What is the frequency of A?
A) 20%
B) 40%
C) 50%
D) 60%
E) 80%
C
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What percentage of the species that have ever lived have become extinct?
a. 1 percent b. 9 percent c. 50 percent d. 75 percent e. 99 percent
What is the route a red blood cell would take to circulate through a kidney, starting from the aorta?
A. renal vein -> glomerulus -> efferent arteriole -> afferent arteriole -> vasa recta -> renal artery B. renal artery -> vasa recta -> afferent arteriole -> efferent arteriole -> glomerulus -> renal vein C. renal artery -> afferent arteriole -> glomerulus -> efferent arteriole -> vasa recta -> renal vein D. renal vein -> efferent arteriole -> glomerulus -> afferent arteriole -> vasa recta -> renal artery E. renal vein -> vasa recta -> afferent arteriole -> glomerulus -> efferent arteriole -> renal artery F. renal artery -> glomerulus -> afferent arteriole -> efferent arteriole -> vasa recta -> renal vein G. renal artery -> afferent arteriole -> vasa recta -> efferent arteriole -> glomerulus -> renal vein
Which of the following types of proteins evolves at the slowest rate?
A) Peptide hormones B) Collagen C) Insulin D) Histones E) Lipoprotein
The __________ are excavates that lack functional mitochondria and Golgi
a. cryptomonads b. chrysophytes c. diplomonads d. water molds e. slime molds