In Mendel’s hybridization experiments, what was the first indication that the blending theory of inheritance was incorrect?

a. All self-crossed offspring were physically identical to their parents except for selected traits like color or size.
b. F2 generation offspring expressed traits according to predictions made using the laws of probability.
c. 100% of the F1 offspring of true-breeding parents expressed dominant traits instead of a blend of both parents’ traits.
d. Offspring of true-breeding parents with recessive traits became infertile when self-crossing after the F3 generation.


c. 100% of the F1 offspring of true-breeding parents expressed dominant traits instead of a blend of both parents’ traits.

Biology & Microbiology

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Xylem is composed of all of the following cell types except:a

tracheids. b. vessel elements. c. fibers. d. parenchyma. e. sieve tube elements

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Which statement about van der Waal interactions is false?

a. They are very strong. b. They are attractive forces. c. They operate over very short distances. d. They form between nonpolar molecules. e. They involve transient regions of positive and negative charges.

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Nitrosylation (addition of NO groups to proteins) occurs on the side chain of which of the following amino acids?

a. Lysine b. Cysteine c. Tyrosine d. Serine or threonine

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Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which phylum?

a. Nematoda b. Ctenophora c. Nemertea d. Porifera e. Cnidaria

Biology & Microbiology