Discuss the advantages of a closed circulatory system, compared to an open circulatory system
What will be an ideal response?
Closed circulatory systems can be more easily controlled so that blood may be shunted to where it is needed most, it can be pumped at a higher pressure (important in very tall or long animals), and therefore is more efficient than an open circulatory system. Is it not surprising that a clam has an open circulatory system, while related mollusks, the squid and octopods have closed circulatory systems, allowing a more active lifestyle.
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In a dihybrid testcross, the individual being examined is crossed to which of the following?
A. An individual who is homozygous dominant for one trait but not the other B. Self-fertilized C. An individual who is homozygous recessive for both traits D. An individual who is heterozygous for both traits
The term haploid refers to having
a. one quarter of the normal amount of chromosomes. b. half of the normal amount of chromosomes. c. the normal amount of chromosomes. d. twice the normal amount of chromosomes
How many chromosomes does an individual with Turner syndrome have?
A) 2n + 1 B) n + 1 C) 2n ? 1 D) n ? 1
The key structural difference between DNA and RNA is
A. As their names indicate, DNA contains deoxyribose, whereas RNA contains ribose. Thus, DNA contains a different sugar than RNA. B. RNA is a polymer, but DNA is not. C. RNA is a protein, while DNA is a nucleic acid. D. All the bases in DNA differ from those in RNA. E. RNA is a double helix, but DNA is not.