In humans, the HIV virus primarily attacks which of the following types of cells?
A. Epidermal cells
B. Red blood cells
C. White blood cells
D. Glial cells
E. Neurans
Ans: C. White blood cells
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
Which of the following is a disadvantage of living in social groups?
a. disease transmission b. interspecific competition c. coevolution d. communication
An autosomal recessive disorder ____
a. requires that only one parent be a carrier b. displays its symptoms in heterozygotes c. is more frequent in males than females d. requires that both parents are carriers e. only affects females
Which of the following best describes a plasmid
A. a small piece of DNA outside the chromosome B. Segments of chromosome that code for a functional product C. A segment of chromosome which is used in conjugation D. Small piece of DNA found in mitochondria E. DNA found only in eukaryotic cells