Which of the following choices places the layers of human skin in the correct order from shallowest to deepest?
a. dermis, epidermis, hypodermis
b. hypodermis, dermis, epidermis
c. hypodermis, epidermis, dermis
d. epidermis, dermis, hypodermis
d
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You have chosen RNA as the most likely molecule to be first enclosed by a membrane. You understand that it has the ability to store information and can self-replicate, but what else is necessary for simple metabolic processes to occur in a timely manner?
A. A biological catalyst. B. Energy from ADP. C. A pump, to drive a concentration gradient. D. A mechanism to control self-replication. E. Both a mechanism to control self-replication and energy from ADP.
RNA cannot be cloned directly. ________, a viral enzyme, is used to convert single-stranded RNA
into ___________ for cloning. Fill in the blank(s) with the appropriate word(s).
Scientists often stain chromosomes from mitotic cells and photograph the chromosomes in the microscope. Each chromosome is cut out of the photograph, the chromosomes are matched up in homologous pairs and they are placed in order of decreasing size. These pictures can be used to screen individuals for chromosomal abnormalities, like extra, missing or grossly altered chromosomes. What is such a picture called?
a) prokaryote b) eukaryote c) karyoplan d) karyokinesis e) karyotype
The findings of Pasteur and others have established that
A) living organisms regularly self-assemble (arise spontaneously) from nonliving matter. B) living organisms do not arise from nonliving matter today, nor did they arise from nonlife in the past. C) advanced organisms cannot arise from nonliving matter, but simple microbial life often does arise from nonlife today. D) life does not arise from nonliving matter today, but in the conditions of early Earth, such an event could have occurred.