Which of the following structures is found in both plant and animal cells?

A. cell membrane

B. chloroplast

C. cell wall

D. large, water-filled vacuole

Why specific base pairing is essential to the processes of transcription

The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles.

List and describe briefly five external factors that must be present or provided to sustain life

Which of the following is NOT a stage in the life cycle of a population? a) growth b) stability c) decline d) none of the above

Avery could barely detect sweetness in a sip of water from a pitcher in which one quarter of a teaspoon of sugar was mixed into a half gallon of water. for taste, this is avery's:

Suppose you are a forensic scientist charged with estimating time-of-death for a newly found dead body. The body has been found in a walk-in freezer which is kept at 20◦F.

What happens during the lyric cycle

What is considered to be the average natural mutation rate that occurs during DNA replication?

What are the major nonrenewable and renewable sources of energy?

Explain the process of hatching eggs under broody hen in rural areas