Biology, 04.05.2020 23:45 yaxcalandreya
What must happen for most areas on Earth to experience all four seasons?
The Sun must reach its highest point in the sky.
The Northern Hemisphere must experience winter.
The axis must be tilted at a certain angle that remains unchanged.
The north end of Earth’s axis must always point away from the Sun.
Answers: 2
Biology, 21.06.2019 21:20
Which codon is the code for the amino acid histidine (his)?
Answers: 1
Biology, 22.06.2019 03:30
Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.
Answers: 2
Biology, 22.06.2019 06:50
Which organelle breaks down sugar molecules that supply energy to the cell ?
Answers: 2
Biology, 22.06.2019 14:00
Which of the following molecules can be broken down into simple sugars? a. nucleic acid b. protein c. lipid d. carbohydrate
Answers: 1
What must happen for most areas on Earth to experience all four seasons?
The Sun must re...
The Sun must re...
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Mathematics, 06.05.2020 04:14