Which are characteristic of type a blood?
a: has anti-a antibodies
b: has anti-b antibodies
c: has surface antigen a on its erythrocytes
d: has surface antigen b on its erythrocytes
e: has neither surface antigen a nor b on its erythrocytes
f: will agglutinate with blood type b

How can you tell the difference between rough er from smooth er?

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?

Some steps in cell division are shown below: 1. chromosomes condense and pair up 2. segments of dna of sister chromatids twist and cross 3. exchange of dna occurs between chromosomes 4. four daughter cells are created that are haploid which of the following steps is least likely to occur during meiosis 1?