1. [1 mark]
In mammals, mature red blood cells are specialized in that they lack
nuclei, mitochondria or ribosomes. Which statement applies to red blood
cells?
A No chemical reactions take place within their cytoplasm.
B. They cannot produce new enzymes.
C. Materials cannot enter red blood cells.
D. Materials cannot exit red blood cells.

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?