Biology TO 2

During transcription, which enzyme moves along the exposed strands and adds complementary nucleotides ….

• Helicase

• DNA polymerase

• RNA polymerase

• Ligase

• Topoisomerase

In which of the following taxa does the mature sporophyte depend completely on the gametophyte for nutrition ….

• Fern

• Bryophyte

• Equisetum sp.

• Cycas rumphii

• Gnetum gnemon

The Hardy-Weinberg principle cannot apply only if ….

• the population is large

• natural selection occurs

• mating is random in the population

• individuals do not migrate between populations

• there are no net mutations that change the allele frequencies

What is the function of trichomes ….

• To generate secretory products to cause sting

• To provide nutrition

• To reduce water loss from the epidermis

• To produce attracting/alluring glucose

• To increase herbivory

What is the name of the interaction, if two species of birds may fight over the tree holes that they both use as nest sites ….

• Interference competition

• Physical competition

• Unstable competition

• Exploitation competition

• Mutualism

Which term below refers to symbiotic relationships that involve fungi living between the cells in plant leaves ….

• Pathogens

• Endosymbioses

• Endophytes

• Lichens

• Mycorrhiza

When iodine solution is used to stain a cell in the laboratory, which cell structure is most readily seen ….

• Vacuole

• Cytoplasm

• Golgi complex

• Lysosome

• Nucleus

A genomic library can be made using a restriction enzyme and DNA ligase only. BECAUSE

cDNA library requires both of these as well as reverse transcriptase and DNA polymerase.

• incorrect, correct

• correct, incorrect

• correct but both do not show cause and effect relationship

• correct but both show cause and effect relationship

• both are incorrect

Seed production by apomixis is a form of sexual reproduction.

BECAUSE

There is fusion of gametes, the embryo is virtually genetically identical to the maternal genotype.

• incorrect, correct

• correct, incorrect

• correct but both do not show cause and effect relationship

• correct but both show cause and effect relationship

• both are incorrect

Which of the following is TRUE of homologous chromosomes ….

(1) They are usually the same size and shape

(2) They are inherited from different parents

(3) They contain the same set of genes

(4) They contain identical DNA sequences

• 4

• 2 and 4

• all of them are correct

• 1 and 3

• 1,2 and 3