Changes in temperature affect organisms in temperate climates by altering the following, EXCEPT
A. animal migration times.
B. breeding seasons.
C. coral reef building.
D. leaf budding time.
E. flowering times.
Answer: C
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Agar
A. is a useful nutrient source for most bacteria. B. is a hydrolysate of proteins. C. stays liquid through the typical range of incubation temperatures. D. has chemical and physical properties that make it almost ideal for solidifying media.
You work in a DNA lab and have been doing karyotypes for research on various animal species. Your labeling has fallen off several of your specimens. You think this karyotype is from a human. How do you know?
1.There are 23 different chromosomes (46 chromosomes total), which is characteristic of humans.
2.Humans do not have Y chromosomes.
3.There are two of each chromosome, which is characteristic of humans.
4.There is no way to tell. You need more information to determine if this karyotype is from a human.
How many codons exist in the genetic code?
a. 3
b. 9 c. 16 d. 64 e. 128
What is one of the cellular differences between human eggs and sperm?
A) Sperm are arrested in meiosis II; eggs have completed meiosis. B) Sperm contain a haploid set of chromosomes; eggs are diploid. C) Sperm have 200,000 times the volume of eggs. D) Eggs have 200,000 times the volume of sperm. E) Sperm are arrested in meiosis I; eggs have completed meiosis.