Eukaryotes are able to express different proteins over time or at certain points in the life cycle by using ________.
A. silencers
B. riboswitches
C. siRNAs
D. mediators
Answer: B
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Which of the following would be classified as a tropic hormone? Select all correct choices
A. thyroid-stimulating hormone (TSH) B. oxytocin C. adrenocorticotropic hormone (ACTH) D. estrogen E. somatostatin
In determining the evolutionary relationships of current species, one needs to ________
A) read along the tree tips: Species closer to each other are always more closely related B) read along the tree tips: Species shown at the tips are arranged in patterns reflecting which groups evolved from others C) read "back" to nodes connecting species to determine common ancestry D) None of the above is an accurate way to read phylogenetic trees.
Which of the following is a key component of the cytoskeleton?
a. centrosome b. microtubules c. DNA d. ribosomes e. endoplasmic reticulum
The organism in Figure 32-1 is a representative of:
a. the phylum Hemichordata.
b. the phylum Echinodermata.
c. the phylum Chordata.
d. the subphylum Urochordata.
e. the subphylum Cephalochordata