The group of bacteria that lack rigid cell walls and take on irregular shapes is:
A) chlamydias.
B) mycobacteria.
C) mycoplasmas.
D) rickettsias.
Answer: C
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When a cell makes a cell membrane bound growth factor that binds to receptors on neighboring cells causing them to proliferate this is an example of _____.
A. endocrine signaling B. direct intercellular signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling
Most apple trees grown from seed produce
a. superior tasting fruit. b. higher yields of fruit. c. unpalatable fruit. d. breed true. e. have less genetic diversity
You discover a new mutation in Drosophila that causes an abnormal wing shape. When a male fly with this mutation is crossed to a homozygous normal female, the F1 are all wild-type phenotypically. The F2 flies consist of 1/2 phenotypically normal females, 1/4 phenotypically normal males, and 1/4 males with abnormal wings. What is the MOST likely explanation for the new mutant allele?
A. It is Y linked. B. It is X linked and recessive. C. It is X linked and dominant. D. It is autosomal and recessive. E. It is autosomal and dominant.
Approximately how many species of bacteria have been isolated from the oral cavity?
a) 50 b) 100 c) 500 d) 700