Which of the following is a cell type associated with sexual reproduction in fungi?
A. sporangiospore
B. dikaryon
C. haustoria
D. pneumocyst
E. mycorrhiza
Answer: B
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You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "amino end" and the "carboxyl end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. protein. C. lipid. D. DNA.
________ from foraminifera make up the White Cliffs of Dover and the stones used to build the great pyramids.
Fill in the blank(s) with the appropriate word(s).
What caused intense selective pressure for terrestrial vertebrates to evolve internal fertilization?
A. There is no mechanism for eggs and sperm to find one another. B. Terrestrial organisms only produce small quantities of gametes. C. The eggs are too small for the males to find and fertilize. D. The gametes could not be released next to each other, as they would soon dry up. E. Gametes and zygotes are vulnerable to predators.
In a dihybrid cross AA BB × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.