Based on fossil evidence, which of the following existed the longest ago?

a. Homo habilis
b. Homo erectus
c. Australopithecus africanus
d. Australopithecus afarensis
e. Homo neanderthalensis


D

Biology & Microbiology

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Sea cucumbers belong to the class Echinoidea

Indicate whether the statement is true or false

Biology & Microbiology

Which of the following diseases is caused by a virus?

a. scarlet fever b. impetigo c. rabies d. diabetes

Biology & Microbiology

In agriculture, male animals are often castrated to modify their behavior and to produce desirable qualities in the meat. What would you predict about hormone levels in castrated male animals? 

A. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low. B. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high. C. Testosterone is low; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are low. D. Testosterone is high; follicle stimulating hormone (FSH) and luteinixing hormone (LH) are high.

Biology & Microbiology

The accumulation of glucose 6-phosphate inside a bacterial cell via phosphorylation of glucose is an example of

A. facilitated diffusion. B. group translocation. C. osmosis. D. plasmolysis. E. diffusion.

Biology & Microbiology