Which statement is true about prokaryotic cells?

O A

They contain a nucleus.

OB They contain a single circular DNA molecule.

O c They lack ribosomes.

D D They usually lack cell walls.

Mary, age 37, is pregnant for the first time, and her doctor has ordered a series of routine screening procedures. mary's doctor probably will not order:

Which of the following life processes is not necessary for an individual organism to survive, but is necessary for the survival of the species A. digestion B. respiration C. regulation • D. reproduction

Sunny and her family have set up camp near a lake. After dinner, they decide to make s'mores. While they were roasting their marshmallows, her mom boiled water for hot chocolate. They talked and laughed until midnight.

The best primary evidence of early saharan history consists of

The respiratory system contains which of the following structures and organs? A. blood, blood vessels, heart B. tonsils, thymus, spleen, red bone marrow C. lymph nodes, lymph vessels D. lungs, respiratory passages, diaphragm

Which actions should a nurse take while caring for a preschooler whose blood lead level is found to be 25 mcg/dl? select all that apply?

Sodium benzoate is a bitter chemical often used in tiny amounts as a food preservative. The ability of humans to taste sodium benzoate is caused by a dominant allele, t. The recessive allele ("non-taster") is n.

Which of the following correctly displays the sequence of developmental milestones? A) blastula → gastrula → cleavageB) cleavage → gastrula → blastulaC) cleavage → blastula → gastrulaD) gastrula → blastula → cleavage

What is true about DNA

Can a person with type O blood receive any other blood type besides type O? Why?