Which mode of reproduction is utilized by most aquatic invertebrates, fish, and amphibians?

A. Asexual reproduction
B. Pathenogenesis
C. External fertilization
D. Internal fertilization
E. Hermaphroditism


Answer: D

Biology & Microbiology

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Which of the following junctions are important for cell signaling?

A. adherins junctions B. gap junctions C. plasmodesmata D. desmosomes E. All of the choices are correct.

Biology & Microbiology

In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see a 9:3:3:1 (black spotted: black solid: brown spotted: brown solid) ratio of offspring, but instead see that almost all offspring are a non-recombinant phenotype. This tells you that

A. that fur pattern (spotted vs. non-spotted) and fur color are maternally inherited. B. that the genes for fur pattern (spotted vs. non-spotted) and fur color assort independently. C. that the genes for fur pattern (spotted vs. non-spotted) and fur color are on different chromosomes. D. that the genes for fur pattern (spotted vs. non-spotted) and fur color are on the same chromosomes. E. that the genes for fur pattern (spotted vs. non-spotted) and fur color are epistatic.

Biology & Microbiology

Plants as well as brown, green, and red algae show a basic life cycle that involves the alternation of generations between a(n)

A. spore and pollen. B. egg and a sperm. C. seed and a cone. D. megaspore and a microspore. E. sporophyte and a gametophyte.

Biology & Microbiology

Lymphocyte receptors are encoded by genes that are assembled by rearrangement and mutation of what molecules?

A. DNA B. pre-mRNA C. tRNA D. mRNA

Biology & Microbiology