answer:
this is the cell theory, which was proposed by Theodor Schwann in 1839
explanation:
- in biology, cell theory is the historic scientific theory
- it states that living organisms are made up of cells, they are the basic structural/organizational unit of all organisms and all cells come from pre-existing cells.
Answer:
The correct option is B) send chemical messages across small gaps between neurons.
Explanation:
Neurons are the cells that make up our nervous system. Although they are connected to each other, they do not maintain physical contact with each other. The nerve impulse travels through the neuron, and when it reaches its dendrites, it is transmitted to the next neuron through the synapse, which is produced through the exchange of chemical substances called neurotransmitters. Neurons communicate with each other through the small spaces (or small gaps) between them, in a process known as synaptic transmission (where synapses are the connections between neurons). This synapse requires neurotransmitters (for example dopamine or glutamate) for the transmission of the signal or message, which after being released will bind to specific receptors causing an ionic change by opening or closing a channel.
Answer:
a transgenic organism is one that contains rDNA; Recombinant DNA
Explanation:
Transgenic organisms are organisms that contain foreign DNA (rDNA) which is normally introduced via biotechnology. The transgene is simply the DNA from another species or it can be also an rDNA from the same species which has been altered in the laboratory then reintroduced into the organism
Answer:
The presence of a larger proportion of unsaturated fatty acids in membranes imparts them fluidity at lower temperatures as required to maintain their normal functioning.
Explanation:
The proportion of unsaturated and saturated fatty acids in membranes regulates their fluidity. At lower temperatures, membranes become more rigid. To maintain their normal fluidity, the proportion of the unsaturated fatty acids in membranes is increased. The unsaturated fatty acids have double bonds in their hydrocarbon tails which in turn do not allow their tight packing and impart fluidity to the membrane core.
At higher temperatures, membranes become more fluid and therefore, the proportion of the unsaturated fatty acids is reduced. The tissues of reindeer at the body's extremities such as those near hooves are exposed to surroundings and thereby, lose heat and have lower temperatures. To maintain the fluidity of membranes, the cells of these tissues incorporate more of the unsaturated fatty acids in their membranes as compared to the tissues in the upper legs where the body temperature is relatively higher.
Answer: <span>A. gk, gK
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The scientist doing a dihybrid crossing using <span>plants with a genotype ggKk. To make the Punnet square, you need to understand how the gamete divided. The square should be
K k
g gK gk
g gK gk
The possible gamete for gg-Kk would be
1. gK
2. gk
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