The simple microscopes used by the earliest practitioners of microscopy contained which of the following?

A. Magnifying lens
B. Oil-immersion lens
C. Condenser
D. Lamp
E. Ocular


Answer: A

Biology & Microbiology

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How is the blood filtered through the glomerulus into the proximal convoluted tubule?

A. Diffusion is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. B. Osmosis is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. C. Blood pressure is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule. D. Active transport is the physical process that causes filtrate to leave the blood and move into the proximal convoluted tubule.

Biology & Microbiology

What enzyme is responsible for proofreading activities during DNA replication?

a. DNA polymerase b. RNA polymerase c. primase d. telomerase

Biology & Microbiology

Which of the following items relate specifically to purines? Select all that apply.A) nucleotides with a single ringB) adenineC) cytosineD) nucleotides with a double ringE) guanine

What will be an ideal response?

Biology & Microbiology

What parts of the transformation procedure are done to increase the competence of the bacterial cells?

a. treatment with calcium b. brief heat shock c. Using a microcentrifuge d. Adding LB to the tube

Biology & Microbiology