An old woman joined a kilomater dash sprint and felt very exhausted afterwards. How did the old woman affect her heart rate?
Molecular scientists can read the DNA code and compare the DNA of different organisms. This concept is used in molecular clocks to determine which of the following?a. Morphological relationshipsb. Molecular phylogeniesc. Evolutionary relationships
Which of the following steps is not critical in the creation of Bt corn?a.Cut out a piece of DNA from a DNA molecule.b.Splice a piece of DNA into DNA from another organism.c.Use a restriction enzyme to form sticky ends in DNA.d.Read the DNA sequence of the piece of DNA to be cut and spliced.
A plasma membrane and a cell wall 1. Are two names for the same thing 2. Have the same structure and different functions 3. Have different structures and the same function 4. Have different structures and different functions Which one would it be?
Which of the following best describes the function for the organelle labelled ‘D’? (a) moves substances across the cell membrane (b) transports materials around the cell (c) controls all cell activities (d) packages materials for export from the cell
Air moves out of the lungs when the (a) diaphragm relaxes and the rib cage moves inward. (b) air pressure inside the lungs is less than the external air pressure. (c) diaphragm contracts and the rib cage expands. (d) air pressure inside the lungs is the same as the external air pressure.
A student investigated how the pressure in a diving pool varied with depth. He filled a balloon with helium and tied it to the end of a long pole. Then he submerged the balloon to various depths and observed the result. Which one of the following best describes what happed to the balloon as it went deeper? (a) The balloon got larger because the pressure of the water around it increased compared with the pressure inside the balloon. (b) The balloon got larger because the pressure of the water around it decreased compared with the pressure inside the balloon. (c) The balloon got smaller because the pressure of the water around it increased compared with the pressure inside the balloon. (d) The balloon got smaller because the pressure of the water around it decreased compared with the pressure inside the balloon.
An eruption is classified as an explosive volcanic eruption based on the amount of which mineral found in the magma?
