Which of the following pertains to typhoid fever?
A) It is acquired via ingestion of contaminated meat.
B) Enterotoxin spreads via the blood.
C) It is caused by several different species of Salmonella.
D) Causative microorganism multiplies in patient phagocytes.
E) It is also called bacillary dysentery.
D
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Hormone action is associated with small quantities of hormone resulting in profound responses in
target tissues. This type of response is
a. amplification. b. a second messenger response. c. a gene activation response. d. a cyclic AMP response. e. a growth factor response.
Between which members of the chordate lineage do vertebrates arise?
1.between lungfishes and amphibians 2.between hagfishes and lampreys 3.just after the tunicates 4.between birds and mammals
Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only
A. while the nuclear pores are open. B. while the DNA is being copied into RNA. C. after the cell is dead. D. while the proteins are being assembled. E. during cell division.
Assume that you are told that a particular organism, Drosophila, has the XO chromosome complement. You are also told that the autosomal complement is a normal 2n. You know that in humans the XO complement is female determining. Would you be correct in
assuming that the Drosophila sex for XO is also female? Choose the answer that includes the correct explanation. A) Yes, the presence of an X chromosome determines a female in both organisms. B) Yes, because sex determination in humans and insects is essentially the same. C) No, the chromosomal basis for sex determination in Drosophila is based on the balance between the number of X chromosomes and haploid sets of autosomes. D) No, it takes two X chromosomes to produce a female in humans and a Y chromosome to produce a male in Drosophila. E) No, sex determination in Drosophila is dependent on the presence or absence of the Y chromosome.