The hypothesis that high pressure forces phloem sap to flow was tested and supported by studies using ____
a. caterpillars
b. radiolabeled hormones
c. vacuum chambers
d. aphids
e. radiolabeled sugars
ANSWER: d
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The main driving force behind protein folding is:
A. hydrogen bonds. B. disulfide bonds. C. van der Waals forces. D. length of polypeptide. E. rate of translation.
DNA replication of a single DNA molecule is referred to as semiconservative because
a. it results in two nonidentical DNA molecules. b. one DNA strand is replicated continuously, while the other must be replicated discontinuously. c. of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA. d. all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA. e. each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.
In cats the allele B produces black, whereas b
produces yellow. Neither gene is dominant, and in the heterozygous state the phenotype is a combination of yellow and black spots called tortoiseshell. The alleles B and b are X-linked. If a tortoiseshell cat has three tortoiseshell kittens and two black kittens, give the genotype and phenotype of the tomcat that produced them, and give the sex of the kittens. What will be an ideal response?
Cephalopods are the only mollusks that have a closed circulatory system
Indicate whether the statement is true or false