12 Questions
What type of receptors do steroid hormones and some amino acid-derived hormones utilize?
Intracellular receptors
Why do lipid-soluble hormones like steroids require carrier molecules when traveling in the body fluids?
To increase their solubility in water-based body fluids
Where does the activated hormone-receptor complex with high DNA affinity typically enter to initiate changes in DNA transcription?
Nucleus
What region of DNA is thought to be targeted by the hormone-receptor complex during gene regulation?
Promoter region
What is the primary function of steroid hormones in terms of gene regulation?
Control protein production
How do steroid hormones exert their effects on genes within target cells?
By interacting with specific receptors in the cytoplasm
What type of proteins are produced in response to hormones?
Enzymes
Which invertebrates rely heavily on neuro-endocrine control systems?
Coelenterates
Which substance is secreted by the rest of a Hydra's body if its head is removed?
'Head activator'
In nematodes, where are the neuro-endocrine secretory structures associated with their nervous systems?
Ganglia
Why do some nematode worms need up to four moults of their cuticle?
To complete their life cycle
What is the effect of the 'head activator' substance secreted by a Hydra?
Regenerates head region
Learn about steroid hormones and some amino acid-derived hormones that utilize cytosolic receptors instead of membrane-bound receptors. Explore how these lipid-soluble hormones easily pass across the plasma membrane of target cells.
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