Birds are able to maintain relatively constant body temperature regardless of external temperature. Therefore, birds are
a. homeopathic.
b. homeothermic.
c. ecdysozoans.
d. apodans.
e. amniotes.
B
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________ is a strict anaerobe with an optimum growth temperature of 105 °C that grows chemolithotrophically on H2 with S0 as an electron receptor or chemoorganotrophically on complex mixtures of organic compounds
A) Pyrodictium B) Pyrolobus C) Pyrobaculum D) Desulfurococcus
Which component of a neural signaling pathway sorts and interprets messages?
a. response b. integration c. transmission d. reception e. action
The genetic condition xeroderma pigmentosum, which can lead to skin cancer, results from the inability to
A) correct UV-induced thymine dimers. B) process the amino acid phenylalanine. C) produce functional hemoglobin. D) correct transitions. E) correct breaks in the X chromosome.
MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle
In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle. Which of the following statements is not a legitimate conclusion from the control experiment? (a) The piercing of the oocyte membrane by a needle is insufficient to cause mitotic spindle formation. (b) An increased volume of cytoplasm is insufficient to cause mitotic spindle formation. (c) Injection of extra RNA molecules is insufficient to cause mitotic spindle formation. (d) Components of an interphase nucleus are insufficient to cause mitotic spindle formation.